how to delete extra space between buttons?

Answer 1

Try this(JSFiddle)

CSS

#main {
    
    height: 25em;
}

#menu {
    background-color: #00b875;
    height: 3em;
}

.buttons {
    text-decoration: none;
    color: #ffffff;
    line-height: 3em;
    display: inline-block;
    padding-left:5px;
    padding-right:5px;
    font-family: courier new;
    -moz-transition: 1s linear;
    -ms-transition: 1s linear;
    -o-transition: 1s linear;
    -webkit-transition: 1s linear;
    transition: 1s linear;
}

.buttons:hover {
    background-color: #0d96d6;
}